Pitted Sedimentary Rock / Cupstone
Sedimentary rock with weathering pit (arenite / sandstone)
sedimentary
Category
Organic Materia (Not A Rock Or Mineral)
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Granite
Intrusive Igneous Rock
igneous
Red Sandstone
Arenite (with Iron Oxide)
sedimentary
Garnet Amphibolite (or Garnet Gneiss)
Garnet amphibolite / Garnet-bearing metamorphic rock
metamorphic
Rhyolite (Porphyritic / Vesicular)
Rhyolite
igneous
Agate Geode
Silicon Dioxide (Chalcedony/Quartz), SiO2
sedimentary
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
mineral
Amethyst
Amethyst (Silicon Dioxide - SiO2)
mineral
Sandstone (Quartz-rich)
Arenite (primarily SiO2)
sedimentary
Schist
N/A (a rock type, not a mineral formula)
metamorphic
Agate
SiO2
Mineral
Sandstone
Sedimentary Clastic Rock (Quartz Arenite)
sedimentary
Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
Amber
Succinates (Organic Fossilized Resin)
mineraloid
Granite
Granite
Igneous
Sandstone Concretion
Carbonate-cemented Sandstone Concretion
sedimentary
Sandstone with Iron Concretion
Arenite with Limonite/Goethite Concretion
sedimentary
Gossan (Iron Hat) with Quartz and Chlorite
Limonite/Goethite-rich Gossan (FeO(OH)·nH2O) with inclusions of Quartz and Chlorite
Mineral/Metamorphic Substrate
Granite
Phaneritic Igneous Rock
igneous
Citrine Geode
Silicon Dioxide (Quartz variety, often heat-treated amethyst): SiO2
mineral
Fossiliferous Chert (with Fossil Shells)
Silicon Dioxide (SiO2) with biogenic inclusions
sedimentary
Chert (and Jasper/Flint variant)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Sandstone (with Iron Staining)
Clastic sedimentary rock (primarily SiO2 with Fe2O3 staining)
sedimentary
Sandstone
Sedimentary Rock (Quartz Sandstone)
sedimentary
Amygdaloidal Basalt
Amygdaloidal Basalt (with secondary mineral infilling)
igneous
Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Sandstone Pebble
Sedimentary Rock (Quartzose Sandstone)
sedimentary
Vesicular Basalt with Siltstone
Mafic Volcanic Rock (Basaltic Composition)
igneous
Turquoise in Matrix
Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)
mineral
Vesicular Basalt
Basalt with secondary mineral infills
igneous
Quartz on Schist
Silicon Dioxide (SiO2) on Foliated Metamorphic Rock
metamorphic
Alabaster
Gypsum (Calcium Sulfate Dihydrate, CaSO4·2H2O)
sedimentary
Jasper and Quartz Breccia
Silicified Breccia / Microcrystalline Quartz
sedimentary
Sandstone
Sandstone (SiO2 dominant)
sedimentary
Granite
Intrusive Igneous Rock
igneous
Rock Crystal Quartz
Silicon Dioxide (SiO2)
mineral
Banded Gneiss
Metamorphic Gneiss
metamorphic
Fire Opal in Host Rock
Amorphous Hydrous Silica (SiO2·nH2O)
mineral
Gold-Bearing Quartz
Silicon Dioxide with Native Gold (SiO2 + Au)
mineral
Tiger's Eye (with Blue Tiger's Eye / Hawk's Eye)
Pseudomorph of Quartz after Crocidolite (SiO2 with inclusions)
metamorphic
Gabbro (or Basalt Pebble)
Mafic Intrusive/Extrusive Igneous Rock
igneous
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary